Just another data point. I ordered 15lb of various ARM ballast on Oct 16th and it shipped Oct 30th and is due to be delivered by USPS on Nov 2nd.
The front page of their web site says 41 days but mine was much quicker.
I also got my #40 and #45 Standard Testing Sieves from Ebay so I'm interested to see how much of this get sifted out as too small or too large.